Abstract: Interaction between group piles and dumbbell shaped cap in a super large bridge was analyzed with ANSYS software of 3-D elasto-plastic finite element method.Spring was used in hyperbolic constitutive equation to model the pile-soil-pile interaction under the vertical load assuming consistency of horizontal displacement on the interface between pile and soil.It could be seen that the curve of settlement and load of pile,the distribution of axial force on the pile top,the curve of load on cap and axial force on the top pile obtained with numerical analysis were agreed with those measured in centrifugal model test.Bearing capacity and settlement of super large pile-cap and pile foundation were thoroughly analyzed with numerical analytical results validated by centrifugal model test.